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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e247abe62f7c5e87ab1b035d4ebb4877686f5d3632491b20aaa61f9b72b7d2' 
  AND token = '5nROzTZj8vMMMLMovH8AkGU+9cqI8rFNy4S6Sl6vrUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}