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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad7c4dd43ed882a240ae978b4fc379b7e73c12ecfb472086fe61fe408a4af96' 
  AND token = 'akNTKcXK1DQVtXN1VOuFVd1dPjIqWRY562hEW06yJVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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