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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1e4527d059a36d355466338b7b28943aebb84aad81a261e2cee837b87b362e' 
  AND token = 'h/47pmoW5OZQ6BeAjRfw3u49smiQMa+Nk2bfCAUq+Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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