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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75376493879dc900e7559492f76efcd3fb9fc8d115dcc524acc4e3c76d90648' 
  AND token = 'A9GENuAFd9H2bnrwWC6PE+IaXXeVN64CRnWUPJdYClE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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