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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc16532fcd946312479008aaad483711ae43b21fb9d31cb5e8dff7d9b4db989e' 
  AND token = '9SO2NJPbxQgllnrQeWdMkVyj95CQ9bckf/PemFF4uJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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