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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c059493be6aca7fe90bfdbf3f5ee584ca92c398137c37159a661619949d0aa9' 
  AND token = '0AofWyeKRUlSNzfZpjRIk8PCAjVYLXvqYaKmjpevS/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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