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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9875dea16725afc39e1e5b1a9b6835efabd26943ed3829a7187c081a8440b0' 
  AND token = 'cfXnqm5Pa8MkAn4NTIngomWR1qmRqMxlWUIwaVIabmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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