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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cd8582bf4c5c8a0f5a3756f2ee1bfaa0a9720284abfe8af732892fc4d7fa07' 
  AND token = 'B3mSCrF83jtrV17/7P8dksh0yb3XJyG1eVCV27nIdJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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