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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207a656f86c5fbcfade0526033ce9b124faedf66b6a7e264080a3e225dda9d78' 
  AND token = '5PNO/DNoDtF4R7CEtErnyLBA4p+/2n/GWX/5La6vXTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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