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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90f7b9d7a802321cc6e7bec2673fecdcc43a6407194f7fb8867647a476d431b' 
  AND token = 'jbg/8TlGPiSDFHgfmBTDD3MTX0VIEt1yLX6n2qbd6JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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