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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a961146cc251d6244b5567d71e8dc7a8fbfa10daaee1c768dfce5acc9196f9a2' 
  AND token = 'S9ho6VQH6hDX+7Oz2ZaHeyUFRd8RgoaZqwUe6vaOBdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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