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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88d3ab4687febe3dc8f8bffd0938bd853809e6d6454b6a5d42b5abe44021e51' 
  AND token = 'U0MCBXi1/515mzMnmCxL5sllW5HKSS1BmtLioQiJAdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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