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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531909e28cbe72b4f178041b6ea0fd48d540afd5f8f31fde01499835ddb9e717' 
  AND token = '3csVmOSj6eJZHqte3ChuN3dOQLuDElskTgxn1rpzgWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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