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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008fef8ef6ee2a6784efacf91c572cc5d70a8ff5c922033c1574fa77084b8a38' 
  AND token = 'RMmYbfqUy9bPrmfVACz/uhu27j2zt5qoAdcgl77YNuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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