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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5489ca56e33893e2121bea0a4b6cb8b4e037f927b61e250780efba04f52e144e' 
  AND token = 'nulc0ggCaYlCMGh7yV3pmHuqrnIfMJSCXDpolS/VH6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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