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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0a7b9e5ac4020a7bd87bfb031c79dd00bf1e44acff61e5a891616c36d445bd' 
  AND token = '4pT7r6xOZk2zPdsR6d1urReNEaaJDfGW5pUsGZCfLBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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