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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdd4d9a561e30e9221c569d2ea04f8d507e73bd55ad471c9849d3f5ddc7dcc3' 
  AND token = '7JGvci7utuRysj/vaESby5Dge6PrOeNnakPVSRSTv7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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