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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e010cd8431f68410d4dba2b3651aa747cf7f8fa0cf19ad7d466a5cde1015d783' 
  AND token = 'XmRr4u+KqL02tU37OlJeVPwdbKjOjwNqbvkOIXUydRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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