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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6f079bf1735c6c9e61fc6a8994adfa3d5c5aa25caee7595bd7cab302cf8fce' 
  AND token = 'uHpbX1tuKlB7f8evLzXDnO670cSAMCislbwm7h13rTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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