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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a48a19693b5140ec56ad08787239e688a2913063a0c4a99540fca1c857d71f' 
  AND token = 'q5XalIilpnNaeHS40TLyNYTGGbPezeG5Q8Hn2iQ8U84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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