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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc13bb09f5429e3ab85912d36c24e4ff2825f4907cc94b307597fd22e7c8ce6' 
  AND token = 'VTeLBaAcki3zwtUzJ6RwR2NF3jqkJsJOJ7aXgAbhJ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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