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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baeaf60058240a92d5b65d2b5c620fab9c16d6f882a0cb2c64e23d0ab5b74927' 
  AND token = 'oAj46+zU9D+yFlhPa0bn5Rg69gYtqe4hP9RHHfv2DIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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