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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e71e70058b3b578255979ef38217f68e40f513bb26a4bf068d74dc06c26480' 
  AND token = 'ExLRUpNKJVyOqW4kk2+TjTFekBCk3AQQ9njb+AkiSVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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