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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cda69477a913621414e786827afce9e1c184e3db3a8d83c79efb2812e2bfd4' 
  AND token = 'YirfT94qG9oAv8XZX9WZj8SLMipcCkFz/SZ9zikGn3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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