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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e194a55adc0f2a4a16b35325338e054a96df83c0c2d349a91e57555209f7d60f' 
  AND token = 'T5Jc7PgelrIStcxYrDfWNJ4ju2KHUjKtc9HqnZdorUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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