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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f156ba771df46027bc47dedd81b09efb072e1ea3397fde0216dd5f62ee2a4b3' 
  AND token = 'RHNkO6mF/7iCD3R8CdxRGJZ84VLK43I9H+HXp36OF6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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