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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcd65366939129f3e95559017a567e3a1c94adb24047ae3b8304ad758d84848' 
  AND token = 'KLIPPA0aZsAM3n2QcMlpblvaXRspotZWMUNcSTdTvQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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