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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4286ffe2288087a57e621c5ddc8fbf3008fe756e1d962ab24cfc21c5bba6a7' 
  AND token = 'r7FL2HGgAGmljVNpUHFZm+uo9XEUKoA3mvkH+semtgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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