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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b06b87db22e97de55bc6f2f9cb88583db7723036c50d54b689766043b7ae685' 
  AND token = 'Wy3QmV/MUZBtASu3OUDF2BXovlZom80JcYyu5hK8H3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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