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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce936c15c62e87ea5fbd45a6b7dceb86e98f63beb508965a2c891f3a6dac35c' 
  AND token = 'W2RfjjwiKHNueVhiWxqo1lq0DpJwTm4AQeVUJhtPhVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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