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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f7f21744bd3673f6225d0f8aec9b6717a39ced3d2bbb76bc9f19fd27ebead4' 
  AND token = 'm0RALogguduU+Gz9BalI7kzVpzkXnPSabfn45LKcQVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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