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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dab17e7b7a8117eec1faddc134fa67dbe5405c47c84b9c053daf902ed22902' 
  AND token = 'Z17CFWYsRiHZEIj4xCVoWb0QRa/i1js8wuMarJv83VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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