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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6de01275d3b203b86d975e6407ed213ca3bf2b6e61c16d1b5b369bc8032364d' 
  AND token = 'TT9yIU/YxeOzrCfrO1NPmMySJiFC8XE+NDbjyYAX3rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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