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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a63f0ec41d5543caca41aa3d9f3ffe433058ca4ce3182f7357f69052274ed9' 
  AND token = 'exqe7A/lHJCm+BAV1HX5YPAUwYf2DLIWZhIwiCDcbdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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