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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0b90f01330b93ef4955c2f1ffe9ac65ceecaf04bfd0099db14115dce8d83f3' 
  AND token = 'Y/E+boFiF/VYZgMWdFq4czQqSJH/HJiFK/GZ/xi/y34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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