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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33007d72a51f8dfe87e09539bdb8b687a0982684fe58356987b9cbe7b09d4f6' 
  AND token = 'TwNBawUerZiA8Xgu3US3OYA4qiDcrsenZ2tp3PpiBxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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