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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9db18670174524929f7376f22e4143666024ce4f963e9166185f668f93cfa3' 
  AND token = '6X30ADSMKW5grJyxZxBPpJfR9HfCP9j1FxN9aSN5N58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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