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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa12066b246817cc43c7b3b1b9bbe50d8da151970b22fca524d2c09209aa33f' 
  AND token = 's74pStNf6Tmcir7MZq54zHmwiwqSDJV1b6D/qpakGi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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