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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfc02713f88699bd2885c5d742495415d215af9acfd37ef50b205d10d94f433' 
  AND token = 'XCLlWlGX+TJLLv2jH04rBAowul9Ei4mLNyApH6Fi6zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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