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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b58df91cf674ea704dba86537209c9ef0133905292f23a6cc5a77c3ad3d5f5' 
  AND token = '6ldfD9eE6pRhPrsbQQArkClGFatrAJU1ohf761qQTmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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