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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e81f8e84f601679b52880b80f7e4715767bc1c57422d88432fdfcf06c6b074' 
  AND token = 'iByQNBPwQGp5rhx8DxgNFokxQuifvnZ6uU7sI05eUew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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