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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9982189fd06dcedcc0701fce27a63e6351eee6a93582dc5acd22e11bc6df5e4' 
  AND token = 'R2Fikn5fs3lf9OMGI95AoEp4dFLwvPQsQ9lLKsns3rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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