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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3464734a6f3c52cfa98b02a7b2cf6e5c98bb8b79e321894587d45704478a7c' 
  AND token = 'QUuMrVze15cm4K86bYW429jHj3N20Yusr2u+14yugzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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