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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4a61be8ca1246469fe109512bc2ab709266ea118a1babd01436061e88d5884' 
  AND token = 'iw0zRx5jC7YcALH/4BGyfR3UnuHMM5DEH+s/aSSln7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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