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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca95c7856234dc11f43f141e952c9d12df18312ef9eff7b917dffc4892a12b5' 
  AND token = 'W/y2qT8ksvz/X00F1rIwD4Q6kMLwo7N08qZpLI84klM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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