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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6aac5dd97f406ca3a83a7182489020e711512739d0c6cb498fa83599f54d326' 
  AND token = 'B6WEhFbxO/9zDrzt/w7gnoEjbe/PM0hxTXZjCDdl4zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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