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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9193eb94e824088dc4643345a0ea1b98ab28143081e48aeb62e899bceef5b2b9' 
  AND token = 'YL9Bi5kbBXN3dba4VWxD63U28YH6HCeR6jrEuH5Dds0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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