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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b30df175592c7f459867a8c8be38c49d2d8ab0f3e4b81d5a78787d7958f094' 
  AND token = '8lN4gUBobByVOuXmLIn9LebfuCick+4kuZ4nrLQQDMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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