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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f3574e4e66f752cc47fb5d546dec71653b54b3423c364c7889cd10cff4d36b' 
  AND token = 'uLXIzB0ACbgloF5VWiZ6mDxwADbsxn2NagzTlSd7uhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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