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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aea4e709f896e4772b504aa321845b6a11818d7365aacbeb6a73b8782bc51a8' 
  AND token = '64pWljoHeQrY181bh4Eckbd5AkUsYO2Dq6epPQle03M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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