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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35e4eb1cead9019435471f8e890673cd3868bfd57220721b681ee83ba93726c' 
  AND token = 'sWWnaKJmhrkBSIzE6OxU5fRZmH0ggrO6I8TX+knJi5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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