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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07d76cf7de4d94245b90ddaeecebbbcc26805275204693c8f0ebe7f9fb7d24b' 
  AND token = 'S6WDXkvWP0by0h1Nvt2QE4TWf97kIyK93M3UqsftDi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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