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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11340c7ab699a6e65a8447d0641a7678d83b845124dea6c24e5c60ff93fccf7c' 
  AND token = 'I24VpezttUjzYAGa8bORKRVcVy+PGX9TKaFOW8Dbf9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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