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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fb3866a2dc3f4e933831d95763b6ebf908022d3745e5ab82d10b46b8e79069' 
  AND token = '//F0d/G/67EB4rltFh/eu1oPFZf4P+++N2jJTnSFIPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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