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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ddb317d09e2f20579b09a95bae18c5899dd59111e7ee984844f4991f1e7dd1' 
  AND token = 'iawk6F8tH6zW+7aC92pxLXVMnIIltFNZkE8CYL6flKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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