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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da25d2aa2f1e46fb5b03f698b5a5082104bad3bc19f4e1af0d8f6a5001060141' 
  AND token = 'IyF+S8bdFvgK2lEEpb3F6nqxkaZjOgdCkIZW+BWPl4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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