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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a49aae0ef7584a8a63d4e7eebd532cc504149f8d21265e49be5c3edbcb7ce5' 
  AND token = 'dahoHGal5O1wgb5zEwv2moEvs2cscHukflXfTTZ460o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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