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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b5e6f1376b55be8dad8b602479f8b72dd0a4f90843b1998d72d396a23d818b' 
  AND token = 'jWZtJD6UhG8FrVadfnP+Qn6jVT4yOff0UGO4MzdEYwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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