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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc10bcd28e6992edeb94093920b5e038f7e9c7883af47c9012ba9a7a2c2c0c69' 
  AND token = 'ZmdTnrRTLeLMXCeXE25BGIfbKCuyDiUHhVV9Sd0ClHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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