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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77db3c0c2924c72a1f7261cc631f01128296dfd33b86ed58e51abb6ef3cebdc5' 
  AND token = '3OAe42aKhZ9Y+Sg23dbKrFj4gDXiJWEToU/KHgLWaYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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