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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc316f68b4b4391a100e1476cc91b630a513fd765e2ddcae9e7a66892d55d7b' 
  AND token = 'e+pUmeDuDNm0Xr+PebhfZ7mWZF/MBsc7eVsKRjYBx4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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