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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdc8bdeca6881eb7c12c228a81c4f448494a92d84806e5fbcaf96c99bf0b129' 
  AND token = 'NyVcX1BXK5e5spCYqqKE2M/5FMMdkVVvdEI/1J++J5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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