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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e2ac60d0d6847666b77453207c7ef894643061b3b66134b0a1c29d715bd46d' 
  AND token = 'fpB5oUi1yP6fLmLEGjmfVgqENAMRvHMoqgst1DNz0yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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