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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec0129089220380b9f5f478550568719066f0ca2ed64deb45e6d9a955c8bf2c' 
  AND token = 'l5nKSaZqJSOHXPvUgt3HexLI9Jkq6RG0z9NKOe5/Wso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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