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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf46de693a9f836ab7d27fa927a939aea80e1d838b4769e4634788784c97a8c2' 
  AND token = 'r/yJugMY6BPOS+D+ERSv9dtfmJvQIdltq7icoyaVXXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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