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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de97fc23cc58f7a72c4927c3b5ba67a80386e932cbf374a8203e60ba9a837c3' 
  AND token = 'hru8SMisoFlIN0rW6dbBZnEkAQRyw71sqRUxnV4GKe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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