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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a6c8863162fa26ec80d0940ff88a608430e1f7fe1c15765e4f030ef0bd5a43' 
  AND token = 'lNDoD0w7pnEsHDTo2jgRgoyqUX+iOEKjo9Btt1ijJzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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