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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3ce8e880494b31d442fb7bf288868f33ba925157b7920dd940bda8e4d886e6' 
  AND token = '6Kl7MM5LYyiXra6VekJGO9UybKygFgW7+l8ptk7OI54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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