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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267c77ad68d7252a3e7f01add1d6fd2b4b677aff9bedc8627d3cb95201563436' 
  AND token = 'XOnNDf6f9KyupREvDPJdgvUgXnGXGzC39mwizPhYf0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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