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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10f175a9c904f632647919c56ae347995c99a2f7c479890899552c0d643d1dc' 
  AND token = '6ItysOm1OuydgRj6MacVgcE5ii6Ir3S4KJjOwIgWSiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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