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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cd6341c173b8151b7837d9d97d4bc7ccc1e331ac10aefb193cebd693b1e68f' 
  AND token = 'eavygnQ8HLf49c+KtDcOQ2A8W7fGYgJfYaxyuREsyEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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