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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf27c7878af0856758ba843e9ff566e17dbcfde5959c62bd0d9eb3dda174b81' 
  AND token = 'khhngGZJlLk5RLIEgyi1RwtZgSerAu4EUBoacg14oqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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