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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0414ff3e957686bcb5fd70e5efe891a7c4885313c9afc127ab8264304d28e3a6' 
  AND token = 'n+sSEkK23L7daP2+aX21MDXMDUrlvEPyzOUZfKC/cj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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