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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c811652d3fe51419312f259b4f2e15bbef00ad0da691b2e4ca34ae2df5ccd6c' 
  AND token = '9R2VNZz6/LVOwiOmndFAblNM6E/nHsABZBjGGOkTpcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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