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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88f68ec33ea3c600b7710484fe978afe09cfb878b51e1c728bec6f07f989c5c' 
  AND token = 'TH4fVxn6mqM6nvZplUN02EYZObmoF707p6DszZbed9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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